retrieval /rɪˈtriːvəl/ noun Learner's definition of RETRIEVAL
[noncount]
: the act or process of getting and bringing back something : the act or process of retrieving something索回;返还;检索
beyond retrieval
1
: not able to be brought back无法取回的;无法回收的 2
: not able to be corrected, cured, etc.无可挽回的;不可治愈的